New construction KFW55 house - heating design, different statements

Wall heating in the bathroom is a great thing. Otherwise, choose a device that receives the [BAFA Förderung], and definitely submit the application in December. Who knows if there will still be such high funding for air-water heat pumps next year... Sure, theoretically it could get better, but I personally don't believe it. And then, as mentioned, place value on a proper underfloor heating system.

What did he do to your heating? Or was he in bed with your wife? :-p

;) simply incapable ... installed a heat pump that kept failing. We have a new one now

Hello everyone,

Thank you very much for the many replies.

So, as I understand it now, it actually doesn’t matter which manufacturer we use? The issue with the noise emission is also very important to us!

But is there also a technical explanation regarding the topic of the drinking water station? What about the running costs? Higher/lower?

Furthermore, what is the technical explanation as to why I should not use a heating buffer? I understand it like this: Normally, water is stored in the buffer for the heating at X degrees and then pumped into the circuit in portions? That way the air-water heat pump does not have to run continuously?!

Best regards

But is there also a technical explanation regarding the topic of drinking water station? How about the running costs? Higher/lower?

Technology see #11. There are not really any running costs. It has great advantages regarding always fresh water, but a higher investment.

Furthermore, what is the technical explanation why I should not use a heating buffer?

Because you already have the biggest buffer called screed. Why should a small buffer be installed first, which then supplies a large buffer? That only loses efficiency. The heat pump therefore does not run differently or more often - just more efficiently.

The heat pump should run as long as possible at as low temperatures as possible.

What is a water buffer supposed to bring you?

To store heat, significantly more heat would have to be put in than the supply line actually needs.

For example, if a supply temperature of 25 degrees would be sufficient, the buffer might have to be operated at 30 degrees just to compensate for the heat losses occurring in the buffer.

So you lose 5 degrees of heat that you would actually need for heating.

If you had heated through at 25 degrees, more heat would have been delivered into the house with less energy.

The main reason for these buffers is usually that the HB or manufacturers want to make sure that enough heat is available for the defrosting process of the air-water heat pump.

The main reason for these buffers is usually that the HB or manufacturers want to make sure there is enough heat for the defrosting process of the air-water heat pump.

Okay, thanks for the information. But do the HB even build systems without heating buffers? If it is about safety for the defrosting process? I think most HB have something in mind. But of course, your explanation with the pipes in the screed as a buffer and that the heat goes directly into the flow and not first into the buffer and possibly loses heat.

Regarding the prices, from my last questions in post #1, are these realistic or is there still potential for savings? Regards